On Fri, May 9, 2014 at 6:11 PM, CDR <vene...@gmail.com> wrote: > I just tested and in fact, the memory restriction does not work. > a) set a 5G limit for the container > b) started the container > c) gave 16 G memory to mysql > D) restarted mysql > it works fine and it also shows the memory on "show variable like '%buffer%'
Did you know that mysql doesn't actually use ALL of the allocated memory on startup? A simple test: - start a container (in my case, precise) - (from the host): check it's current memory usage, then set memory limit to something a little higher # lxc-cgroup -n precise memory.usage_in_bytes 92422144 # lxc-cgroup -n precise memory.limit_in_bytes 100000000 # lxc-cgroup -n precise memory.limit_in_bytes 100003840 some rounding take place. 100003840 bytes = 97660 kB - start a memory-hog program in the container. In my case I use php to read a big file to memory # truncate -s 1G /tmp/1G # php -r 'file("/tmp/1G");' Killed - examine what happened from the hosts's syslog May 9 18:35:26 trusty kernel: [37187.222425] php invoked oom-killer: gfp_mask=0xd0, order=0, oom_score_adj=0 ... May 9 18:35:26 trusty kernel: [37187.222483] Task in /lxc/precise killed as a result of limit of /lxc/precise May 9 18:35:26 trusty kernel: [37187.222484] memory: usage 97660kB, limit 97660kB, failcnt 15540 May 9 18:35:26 trusty kernel: [37187.222485] memory+swap: usage 0kB, limit 18014398509481983kB, failcnt 0 May 9 18:35:26 trusty kernel: [37187.222486] kmem: usage 0kB, limit 18014398509481983kB, failcnt 0 May 9 18:35:26 trusty kernel: [37187.222487] Memory cgroup stats for /lxc/precise: cache:116KB rss:97544KB rss_huge:0KB mapped_file:52KB writeback:0KB inactive_anon:24KB active_anon:97544KB inactive_file:0KB active_file:0KB unevictable:0KB ... May 9 18:35:26 trusty kernel: [37187.222569] Memory cgroup out of memory: Kill process 15446 (php) score 937 or sacrifice child May 9 18:35:26 trusty kernel: [37187.222571] Killed process 15446 (php) total-vm:1108108kB, anon-rss:94008kB, file-rss:16kB You get the idea. -- Fajar _______________________________________________ lxc-users mailing list lxc-users@lists.linuxcontainers.org http://lists.linuxcontainers.org/listinfo/lxc-users